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An electric vehicle simulation system with battery in the loop (BIL) is described in this paper.Virtual models are used for the other parts of power train including the electric motor/controller,transmission and vehicle dynamics,which allows the easy change of system parameters and rapid evaluation of vehicle and battery performance for different vehicle configurations.Tests were conducted using the system and the measurements (voltage and current,efficiency) obtained from the real battery were compared with those obtained from a standard nominal model of the battery.The results indicate that the measured voltage and current between the real battery and those obtained from the model are significantly different.Additionally,it is expected that the difference will increase significantly as the battery ages.